Velamentous Cord Insertion?

So my sister just found out that her baby boy has velamentous cord insertion. From what I understand it is when the umbilical cord attaches to the amniotic sac rather than the placenta and is susceptible to rupture. She is going to be going to her OB one week and a high risk OB the next week for the remainder of her pregnancy, and she will be having a c section at 35 weeks if the baby makes it that far (after a round of steroids for baby’s lungs).

Does anyone have any experience with this condition, or know anyone who has? I’m just not sure if this is one of those things that sound worse than they are or if it is something where I should be preparing for the worst. I’m so scared for my little nephew 🙁

This isn’t usually picked up on ultrasound, usually just noted after delivery. Unless the placenta is really low (near the cervix), I can’t imagine why they would need to deliver so early, just pre-emptively. Although maybe it’s more severe than what I’m imagining. But I will tell you that it’s usually an after-delivery “huh” when the doctor looks at the placenta, and doesn’t usually lead to major issues in pregnancy. Good luck.